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Title: Weyl points and topological nodal superfluids in a face-centered-cubic optical lattice
Authors: Lang, Li-Jun
Zhang, Shao-Liang
Law, K. T.
Zhou, Qi
Keywords: Ultracold Gases
Weyl Semimetal
Issue Date: 2017
Source: Lang, L.-J., Zhang, S.-L., Law, K. T., & Zhou, Q. (2017). Weyl points and topological nodal superfluids in a face-centered-cubic optical lattice. Physical Review B, 96(3), 035145-. doi:10.1103/PhysRevB.96.035145
Series/Report no.: Physical Review B
Abstract: We point out that a face-centered-cubic (fcc) optical lattice, which can be realized by a simple scheme using three lasers, provides one a highly controllable platform for creating Weyl points and topological nodal superfluids in ultracold atoms. In noninteracting systems, Weyl points automatically arise in the Floquet band structure when shaking such fcc lattices, and sophisticated design of the tunneling is not required. More interestingly, in the presence of attractive interaction between two hyperfine spin states, which experience the same shaken fcc lattice, a three-dimensional topological nodal superfluid emerges, and Weyl points show up as the gapless points in the quasiparticle spectrum. One could either create a double Weyl point of charge 2, or split it into two Weyl points of charge 1, which can be moved in the momentum space by tuning the interactions. Correspondingly, the Fermi arcs at the surface may be linked with each other or separated as individual ones.
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.96.035145
Schools: School of Physical and Mathematical Sciences 
Rights: © 2017 American Physical Society (APS). This paper was published in Physical Review B and is made available as an electronic reprint (preprint) with permission of American Physical Society (APS). The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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